ASME CSD-1-2006 pdf free download.Controls and Safety Devices for Automatically Fired Boilers.
CF-lb Burner Assemblies and Boiler Units
(a) Burner assemblies for boiler units having inputs in excess of 41)0.(X)() lku/hr (117228 W) shall comply with the provisions of this Part. Burner asseniblics, as part of a boiler unit or separately, shall bear a label and/or be listed by a nationally recognized testing agency or other organization that is acceptable to the authority having jurisdiction as complying with the standards referenced below. For a burner provided as an integral part of a boiler unit, the label on the boiler unit may serve as cvidence that the burner is in compliance.
(1) UI 795, Standard for Commercial-Industrial Gas Heating Equipment, or
(2) ANSI Z21.13/CSA 4.9, Gas-Fired low Pressure Steam and Hot Water Boilers, or
(3) ANSI 721 .56/CSA 4.7, Gas-Fired Pool Heaters (hI Boiler units having inputs of 400,000 BLu/hr
(117228W) or less, with field-Installed gas burner assemblies and boiler units that do not comply with ANSI Z2L13/CSA 49 shall comply with the provisions for purging, safety control timing, action on flame failure. loss of combustion air, combustion air proving, and fuel supervision given in Table CF-I or CF-2, as applicable.
(c) Field-installed, oil-fired assemblies having inputs of 400,11(10 lttu/hr (117 228 W) or less shall hear a label and/or be listed by a nationally recognized testing agency or other organization that is acceptable to the authority having jurisdiction as complies with ANSI Z21.1 7/CSA 2.7, Standard for Domestic Gas Conversion Burners. The units on which they are installed shall comply with the provisions of this Standard.
(d) Boilers tiring liquefied-petroleum gases or 12-gas air mixtures, that do not comply with ANSI 221.13/ CSA 4.9, which are installed indoors, shall be equipped with safety shutoff devices of the complete shutoff type. A safety shutoff device of the complete shutoff type is one that will shut off the gas flow to both the main burner(s) and pilot burner(s) in the event of main flame, pilot flame, or Ignition failure.
(e) The provisions of this Part are intended to apply to equipment supplied with gas pressures not in excess of the following:
U) 10 psig (69 kPa gage) for boilers firing gas-air mixtures within the flammable range (i.e., 5% to 15% by volume natural gas in air and 2.15% 109.6% by volume propane in air)
(2) 20 psig (140 kPa gage) for boilers firing
liquefied-petroleum gas
(3) 60 psig (414 kPa gage) for all other boilers
CF-120 Fuel Train
(a) See Nonmandatory Appendix B for typical fuel train diagrams. Fuel train designs. other than those pictuwd in Nunmandatory Appendix B, but meeting the requirements of this Standard, shall be permitted.
(b) Thread scaling compounds used on threaded joitits of gas piping shall be resistant to the action of liquefied-petroleum gases.
CF-130 Filters or Strainers
Fuel cleaning equipment such as filters or strainers are recamniended for use in the main gas supply line to the unit.
CF-140 Sediment Traps (Ot
A sediment trap shall be installed upstream and as close as feasible to the inlet of the gas control(s). When a vertical section of piping supplied by the manufacturer is on the upstream side of the gas control(s), a sediment trap shall be installed. When a vertical section of piping is not supplied, installation instructions supplied by the manufacturer shall specify that a sediment trap be installed upstream and as close to the gas control(s) as feasible at the time of the boiler’s installation.
CF-150 Manually Operated Gas Shutoff Valves
(a) Manually operated main shutoff and pilot shutoff valves, in sizes larger than NI’S 2 or for pressures greater than “2 psig (3.4 kPa gage), shall be hail or lubricated plug-type, with stops. All manually operated valves shall be the Ievcr’handlcd type and shall have the handle permanently attached, parallel to the gas flow when in the open position. The handle shall be accessible and shall clearly indicate the “on” and “off” positions.